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Probing the circumnuclear environment of NGC 1275 with high-resolution X-ray spectroscopy
Fabian, Andrew C.; Fukazawa, Yasushi; Veilleux, Sylvain +6 more
NGC 1275 is the brightest cluster galaxy (BCG) in the Perseus cluster and hosts the active galactic nucleus (AGN) that is heating the central 100 kpc of the intracluster medium atmosphere via a regulated feedback loop. Here, we use a deep (490 ks) Cycle-19 Chandra High-Energy Transmission Grating (HETG) observation of NGC 1275 to study the anatomy…
Carbon-chain molecule survey toward four low-mass molecular outflow sources
Li, Di; Qin, S. -L.; Esimbek, Jarken +4 more
We performed a carbon-chain molecule (CCM) survey toward four low-mass outflow sources, IRAS 04181+2655 (I04181), HH211, L1524, and L1598, using the 13.7 m telescope at the Purple Mountain Observatory (PMO) and the 65 m Tian Ma Radio telescope at the Shanghai Observatory. We observed the following hydrocarbons (C2H, C4H, c-C<…
The formation history of the Milky Way disc with high-resolution cosmological simulations
Lattanzi, Mario G.; Re Fiorentin, Paola; Spagna, Alessandro +3 more
We analyse from an observational perspective the formation history and kinematics of a Milky Way-like galaxy from a high-resolution zoom-in cosmological simulation that we compare to those of our Galaxy as seen by Gaia DR2 to better understand the origin and evolution of the Galactic thin and thick discs. The cosmological simulation was carried ou…
Eclipsing Binary Populations across the Northern Galactic Plane from the KISOGP Survey
Kobayashi, Naoto; Maehara, Hiroyuki; Matsunaga, Noriyuki +8 more
We present a catalog of eclipsing binaries in the northern Galactic plane from the Kiso Wide-Field Camera Intensive Survey of the Galactic Plane (KISOGP). We visually identified 7055 eclipsing binaries spread across ∼330 deg2, including 4197 W Ursa Majoris/EW-type, 1458 β Lyrae/EB-type, and 1400 Algol/EA-type eclipsing binaries. For all…
Optically detected galaxy cluster candidates in the AKARI North Ecliptic Pole field based on photometric redshift from the Subaru Hyper Suprime-Cam
Hashimoto, Tetsuya; Goto, Tomotsugu; Kim, Seong Jin +23 more
Galaxy clusters provide an excellent probe in various research fields in astrophysics and cosmology. However, the number of galaxy clusters detected so far in the AKARI North Ecliptic Pole (NEP) field is limited. In this work, we provide galaxy cluster candidates in the AKARI NEP field with the minimum requisites based only on the coordinates and …
Mapping Gaia Parallax Systematic Errors over the Sky with Faint Milky Way Stars
Fardal, Mark A.; Sohn, Sangmo Tony; del Pino, Andrés +1 more
Parallaxes measured by the Gaia mission have huge significance for astronomy, but parallaxes in Gaia DR2 are known to have systematic errors that depend on the source position and other quantities. We use the abundant information in faint Milky Way stars, along with the Gaia Object Generator simulation of the Gaia catalog, to probe the spatial dep…
X-ray obscuration from a variable ionized absorber in PG 1114+445
Piconcelli, E.; Gaspari, M.; Tombesi, F. +9 more
Photoionized absorbers of outflowing gas are commonly found in the X-ray spectra of active galactic nuclei. While most of these absorbers are seldom significantly variable, some ionized obscurers have increasingly been found to substantially change their column density on a wide range of timescales. These NH variations are often conside…
Chandra Observations of Abell 2261 Brightest Cluster Galaxy, a Candidate Host to a Recoiling Black Hole
Lauer, Tod R.; Ogle, Patrick; Postman, Marc +4 more
We use Chandra X-ray observations to look for evidence of a recoiling black hole from the brightest cluster galaxy in Abell 2261 (A2261-BCG). A2261-BCG is a strong candidate for a recoiling black hole because of its large, flat stellar core, revealed by Hubble Space Telescope imaging observations. We took 100 ks observations with Chandra and combi…
Two Luminous Post-AGB Stars in the Galactic Globular Cluster M19
Bond, Howard E.; Ciardullo, Robin; Siegel, Michael H. +1 more
We report the discovery of a luminous "yellow" post-asymptotic giant branch (PAGB) star in the globular cluster (GC) M19 (NGC 6273), identified during our uBVI survey of Galactic GCs. The uBVI photometric system is optimized to detect stars with large Balmer discontinuities, indicating very low surface gravities and high luminosities. The spectral…
Planets around young active solar-type stars: assessing detection capabilities from a non-stabilized spectrograph
Petit, P.; Wittenmyer, R. A.; Heitzmann, A. +8 more
Short-orbit gas giant planet formation/evolution mechanisms are still not well understood. One promising pathway to discriminate between mechanisms is to constrain the occurrence rate of these peculiar exoplanets at the earliest stage of the system's life. However, a major limitation when studying newly born stars is stellar activity. This cocktai…